Syringe



Patented Jan. 16, 1951 srnmon Arthur E. Smithi Los Angeles, Calif.Application January 10, 1948, Serial No. 1,551

1 Claim.

This invention relates to a syringe.

The general object of the invention is to provide an improved syringe ofthe disposable type which will permit the quick preparation and readyuse of a medicinal solution.

A further object of the invention is to provide a syringe including anovel plunger member.

A further object of the invention is to provide a novel plunger memberfor use in the syringe.

Other objects and advantages of the invention will be apparent from thefollowing description taken in connection with the accompanyingdrawings, wherein:

Fig. 1 is a side elevation with parts in section showing my improvedsyringe and one type of discharged therefrom.

Referring to the drawing by reference characters, I have shown myinvention as embodied in a syringe, indicated generally at In. As shownthe syringe includes a cylindrical barrel II having a closure I2 at thefront end thereof, the

closure l2 including a flange I3 engaging the outer end of the barrel,and the closure is provided with an outer bore M which is separated by adiaphragm I5 from a second bore l6, which in turn communicates with anenlarged bore I1. Within the bore It I arrange a medicinal tablet l8 andin the bore I! a displaceable sealing disc l9.

Upon the barrel II I arrange a front end closure indicated generally at22 and which includes a skirt 23, having a finger engaging flange 24thereon. The front end closure includes a tapering tip 25 and this tipis provided with an axial bore 25, separated by a diaphragm 21 fromanother bore 28. The bore 2 8 communicates with a bore 29 and the bore29 communicates with a bore 30 which has a tapering wall 3! at one endthere of. The tip 25 has an end aperture 32.

A hypodermic needle has a hub 36 thereon, the inner end of which isbeveled as at 31 to fit the tapering wall 3! in the bore 39.

The barrel I I has a plunger 40 in the rear end thereof. The plunger 46comprises a tubular member 4|, having a piston stopper 42 in the frontend thereof. The piston stopper is in the nature of a cup and includes pr ph r l beads 2 v 43 with a diaphragm 44 at the inner end of the cupand with an, indentation 45 coaxially arranged. At its outer end theplunger includes a stopper 46 which has a pheripheral flange 41 and anaxial recess 48 and with an indentation 49 coaxial with the recess 48. V

In operation, with the parts as shown in Fig. 2, the person using thesyringe pushes in on the hub 36, causingthe inner end 50 of the needleto pierce the diaphragm I5 and thereafter dislodge the disc I9 to causethe tablet I8 to be discharged into the vehicle 5| within the barrel II.The syringe is then ready for use and by pressing on the stopper 46 theplunger is moved forward, causing the ampule contents to be discharged.

The syringe may be filled in any desired manner, although I prefer tohave the parts arranged with the plunger fully within the ampule andthen I insert the end of a hypodermic needle ti through the stopper 46and the piston stopper 42. The needle BI communicates with a chamber 62in which a piston 63 operates by means of a finger button 64. When thebutton 64 is depressed, liquid will fiow into the ampule I I, causingthe piston to withdraw until it is in the position shown in Fig. 2,whereupon the needle 6| is removed and the syringe is ready for shipmentor use.

In the present application, Serial No.1.5 51,filed January 10, 1948, theclaim is directed to the piston stopper which is hollow and haspierceable front and rear closures therein, the front closure acting asa plunger and both closures being pierceable by the needle of a fillingapparatus.

In applicants copending application Serial No. 548, filed January 5,1948, the claim is directed to the outer barrel with a front closuretherein and the claim includes the sliding barrel forming ampule withinthe outer barrel and with the piston closure in the sliding barrel atits front end. The claim also includes the piston plunger within thesliding barrel and having a piston head thereon.

Applicants copending application Serial No. 2,900, filed January 17,1948, relates to a syringe wherein there is a barrel having a frontmember, a recess and with a needle extending through the front memberand recess and having a protuberant portion engageable in the recess andwith 'the needle adapted to be advanced to its seated position by meansof a protective cap carried upon the needle.

From the foregoing description it will be apparent that I have inventeda novel syringe which can be economically manufactured and which ishighly efficient for its intended purpose.

Having thus described my invention, I claim:

A disposable syringe including a barrel having a resilient closureconstruction at the front end thereof, a resilient end member on thebarrel, said closure construction including an outer recess and an innerrecess with a pierceable diaphragm between the recesses, a needlemovably mounted in the end member, said needle having its inner enddisposed normally adjacent to said diaphragm and being adapted to piercesaid diaphragm when the needle is moved inwardly, a piston plungerwithin said barrel, said piston plunger including an elongated tubularbody having a piston head mounted on the innerend thereof, said pistonhead being made ofresilient material and having a peripheral portionslidable within the barrel, said piston head having a recess with aresilient, pierceable, imperforate diaphragm closing said last mentionedrecess, said piston plunger having a resilient closure at the outer endthereof, said last mentioned closure having a recess and a resilient,pierceable, imperforate diaphragm closing said last mentioned recess,said piston plunger being movable in the barrel to force the contentstherefrom, said resilient, pierceable, imperforate diaphragms beingadapted to be pierced by a barrel filling needle with the holes madetherein by the filling needle closing by the resiliency of the materialwhen the filling needle is withdrawn.

ARTHUR. E. SMITH.

REFERENCES CITED The following references are of record in the file ofthis patent:

